This recent Apple patent application was dug up that's titled "Long Throw Acoustic Transducer," and it relates to a playback element in the thin device iOS environment. The idea behind it is that it has two permanent magnets that are joined by a linkage with a high magnetic permeability to form a a piston that is inserted into a housing. There are two pole coils surround the housing with each coil adjacent to one of the magnets, and they oscillate within the housing when an electrical signal is applied. One of the magnets can have a vent passage, but that's not entirely necessary. The whole idea is to provide a greater volume of air from a compact device than was previously possible.
We don't know for sure because it's not marked, but it doesn't look like the transducer in the new iPhone 6 plus is using this technology yet. Here's a picture of it thanks to the breakdown of the phone on ifixit. Either way, the boffins at Apple haven't forgotten audio, and we Mac/iPhone/iPad fanboys should be thankful.
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